American Society of Civil Engineers


Pressure-Flow Relationships for Distribution System Connections


by Srinivasa Lingireddy, (Assoc. Prof. of Civ. Engrg., Univ. of Kentucky, Lexington, KY 40506-0281) and Don J. Wood, (Prof. of Civ. Engrg., Univ. of Kentucky, Lexington, KY)

Journal of Hydraulic Engineering, Vol. 126, No. 10, October 2000, pp. 786-791, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9429(2000)126:10(786))

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Document type: Technical Note
Abstract: The suggested practice of using single point test data to construct a “straight line” (i.e., hydraulically scaled) water supply plot is investigated herein. It is shown that this widely used practice may lead to large errors in determining the available pressure at a connection for a design flow condition. It is further shown that using a second test point to construct a quadratic water supply plot can produce far better accuracy. Inaccurate plots of the available pressures can lead to erroneous fire flow predictions and improperly designed fire protection sprinkler systems. This raises safety concerns in addition to poorly designed facilities.


ASCE Subject Headings:
Design
Pipelines
Pressure
Tests
Water distribution systems
Water supply